Marking instrument.



No. 742,047. I PATENTED 06120 1903. I

- P. MOEHLE.'

MARKING IN TRUMENT. APPLICATION PILBD'DIW. 26, 1902.

' A-TTOHNE Y3.

- WI TNESSES:

1 PETERS co, Puma-mud. wAsHmmom-i cl NITED STATES Patented October 20,1903.

FRIEDRICH MOEHLE, OF MASON CITY, IOWA.

MARKING INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 742,047, dated October20, 1903. Application filed December 26, 1902. Serial No. 136,646. (Nomodel) To all whom it may concern:

Be it known that I, FRIEDRICH MOEHLE, a citizen of the United States,and a resident of Mason City, in the county of Cerro Gordo and State ofIowa, have invented a new and Improved Marking Instrument, of which thefollowing is a full, clear, and exact descrip tion.

This invention relates to a device used for describing and laying offvarious figures, such as circles, ovals, and squares. It is especiallyuseful in marking off mats for pictures; but obviously it may be used inmany other connections.

The device comprises a base with a central pin and a number of groovesof various forms therein. On the pin an arm is mounted to slide and toswing, said arm having a pin arranged to run in any of thebefore-mentioned grooves. By adjusting this pin in the desired groovethe arm may be swpng over the base and various ovals or circlesdescribed. Other measurements may be made by the arm for describingsquares and other analogous figures.

This specification is an exact description of one example of theinvention, while the claims define the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a plan view of the invention. Fig. 2 is a longitudinalsection thereof, and Fig. 3 is a detail perspective view of the arm.

0. indicates the base, which is preferably provided with pins 0tprojecting from its bottom and facilitating holding the base stationaryon the work. The base is formed in its upper face with a number ofovateand circular grooves c 1) indicates the central pin, which isfitted to move axially in the base and which is held down in theposition shown in Fig. 2 by means of a spring I). At its upper end thepin 1) is provided with a head 12 and this is received in a grooves inan arm 0, thus mounting the arm 'to slide longitudinally on the pin andto swing around the center thereof. The arm 0 has a pin 0 which projectsabove and below the arm, the lower end of the pin being adapted to enterany one of the grooves Q The spring 1) holds the base yieldingly in theposition shown in Fig. 2; but by compressing the spring and drawingupward the pin 1) the pin 0 may be disengaged from one groove andengaged with another.

d indicates an extension of the arm 0, which extension is preferablyconstructed of a metal plate having a triangular head 61' and a numberof orifices d along its length. The arm 0 has overhanging guides 0 sothat the extension (1 may be held slidably on top of the arm and the pin0 entered into any one of the perforations C1 The extension dispreferably provided with a scale, as shown, so that measurements may bemade therefrom.

The use of the invention will be quite apparent from the foregoingdescription. To describe a circle, the pin 0 should be adjusted to thecircular groove 0. and to describe.

ovals this pin should be adjusted to an ovate groove. A square may belaid down by taking the desired measurements from the center of the basea along the arm d, and when these measurements are laid off the squaremay be drawn with a ruler. Also the extension (1 ofthe arm may beentirely removed from the device and used as a straight-edge and ruleindependently of the other parts of the device.

This invention may be used with or independently of the marking-bardisclosed in my copending application,Serial No.113,126,filed June 25,1902.

Various changes in the form, proportions, and minor details of myinvention may be resorted to at will without departing from the spiritand scope thereof. Hence I consider myself entitled to all suchvariations as may lie within the intent of my claims.

Having thus described my invention, I claim as new and desire to securebyLetters Patent- 1. The combination with a base having a groovetherein,of an arm mounted to turn and to slide on the base and having apart running in said groove, for the purpose specified, and an armextension mounted on the arm,the said arm having overhanging guidesloosely ongaging the arm extension and also having a projected portion,and the arm extension being perforated to engage said projected portionof the arm.

2. The combination of a base having a groove therein, a headed pin, aspring yieldingly holding said pin in operative position, an arm havinga groove therein, said pin extending through the groove and the headengaging the upper surface of the arm, whereby to mount the arm to turnaround the pin and to slide thereon and a pin attached to the arm andWorking in the groove in the base.

3. The combination of a base having a groove therein, aheaded pin, aspring yieldingly holding said pin in operative position, an arm havinga groove therein, said pin extending through the groove and the headengaging the upper surface of the arm, whereby to mount the arm to turnaround the pin and to slide thereon, and a pin attached to the arm andWorking in the groove in the base,and an arm extension adjnstablymounted on the arm.

In testimony whereot I have signed my name to this specification in thepresence of two subscribing Witnesses.

FRIEDRICH MOEHLE.

\Vitnesses:

J. 0. BROWN, W. E. SATTERLEE.

